公开(公告)号：US10513769B2

公开(公告)日：2019-12-24

申请号：US15125803

申请日：2014-11-03

Applicant: NINGXIA ORIENT TANTALUM INDUSTRY CO., LTD.

Inventor： Yuewei Cheng ,  Fukun Lin ,  Xueqing Zhang ,  Guoqing Luo ,  Haiyan Ma ,  Yinghui Ma ,  Yanjie Wang ,  Xuanyu Wang ,  Dongjie Zhang

IPC: C22F1/18 ,  B22F9/20 ,  B22F1/00 ,  H01G9/052 ,  B22F3/10 ,  B22F5/00 ,  B22F9/24 ,  C21D3/02 ,  H01G9/00 ,  H01G9/042 ,  H01G9/04

Abstract: The invention relates to the rare metal smelting field, and particularly, the present invention relates to a tantalum powder for preparing capacitors and a process for preparing the tantalum powder, and to a sintered anode prepared from the tantalum powder. As to the tantalum powder as provided by the invention, its primary tantalum powder has a BET of from 3.0 to 4.5 m2/g. After the secondary agglomeration, the tantalum powder has a large particle size. The tantalum powder has an average Fisher sub-sieve size (FSSS) of 1.2 to 3.0 μm wherein as measured with a standard sieve mesh, more than 75% of tantalum powder has a +325-mesh, and a particle size distribution D50 of more than 60 μm, that is, the secondary particle size is high. A resultant capacitor anode prepared by sintering the tantalum powder of the invention at 1200° C. for 20 minutes and then being energized at the voltage of 20 V has the specific capacitance of from 140,000 to 180,000 μFV/g and the residual current of less than 1.0 nA/μFV. Meantime, the invention provides an economical process for making the tantalum powder.

公开(公告)号：US11534830B2

公开(公告)日：2022-12-27

申请号：US16958150

申请日：2017-12-27

Applicant: NINGXIA ORIENT TANTALUM INDUSTRY CO., LTD.

Inventor： Haiyan Ma ,  Hui Li ,  Guoqing Luo ,  Yuewei Cheng ,  Chunxia Zhao ,  Xueqing Chen ,  Zhidao Wang ,  Fukun Lin ,  Guoqi Yang ,  Ning Wang ,  Yinghui Ma ,  Yanjie Wang ,  Lijun Li ,  Honggang Zhang

IPC: B22F9/20 ,  B22F3/10 ,  B22F9/04 ,  B22F1/05 ,  B22F1/142 ,  H01G9/042 ,  C22C1/04 ,  B22F9/24 ,  C22C27/02 ,  H01G9/052

Abstract: A tantalum powder, a tantalum powder compact, a tantalum powder sintered body, a tantalum anode, an electrolytic capacitor and a preparation method for tantalum powder. The tantalum powder contains boron element, and the tantalum powder has a specific surface area of greater than or equal to 4 m2/g; the ratio of the boron content of the tantalum powder to the specific surface area of the tantalum powder is 2˜16; the boron content is measured in weight ppm, and the specific surface area is measured in m2/g; Powder that can pass through a ρ-mesh screen in the tantalum powder accounts for over 85% of the total weight of the tantalum powder, where ρ=150˜170; and the tantalum powder with high CV has a low leakage current and dielectric loss, and good moldability.

公开(公告)号：US10074486B2

公开(公告)日：2018-09-11

申请号：US14767243

申请日：2013-12-25

Applicant: NINGXIA ORIENT TANTALUM INDUSTRY CO., LTD. ,  NATIONAL ENGINEERING RESEARCH CENTER FOR SPECIAL METAL MATERIALS OF TANTALUM AND NIOBIUM

Inventor： Guoqi Yang ,  Aiguo Zheng ,  Xueqing Chen ,  Fukun Lin

IPC: B32B15/02 ,  H01G9/042 ,  B22F9/04 ,  H01G9/15 ,  B22F1/00 ,  H01G9/052 ,  H01G9/04

CPC classification number: H01G9/042 ,  B22F1/0007 ,  B22F9/04 ,  B22F2009/043 ,  B22F2999/00 ,  H01G9/052 ,  H01G9/0525 ,  H01G9/15 ,  H01G2009/05 ,  Y10T428/12014 ,  Y10T428/12028 ,  Y10T428/12035 ,  Y10T428/12181 ,  B22F1/0048 ,  B22F1/0055

Abstract: A method for providing a tantalum powder with a piece+block structure, comprising the following steps: 1) providing a granulous tantalum powder, and dividing same into a first part and a second part; 2) putting the first part of the tantalum powder in a ball mill for ball milling, taking the powder out after the ball milling and sieving same, and obtaining a tantalum powder in the form of a piece; 3) mixing the tantalum powder in the form of a piece and the second part of the tantalum powder to obtain a mixture, and preferably, the mixing proportion of the tantalum powder in the form of a piece and the granulous tantalum powder being 1:0.1˜1, preferably being 1:0.25˜0.8, and more preferably being 1:0.4˜0.6; and 4) performing the steps of water washing, acid washing, and nodularization on the mixture to finally obtain a tantalum powder with a piece+block structure.